Using 31 years of combined public timing data for PSR J1939+2134, the paper reports a nearly sinusoidal timing variation with a period close to the data span, which it interprets as either a moon-sized planet at about 11 AU or slow precession.
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The 31-year Rotation History of the Millisecond Pulsar J1939+2134 (B1937+21)
Using 31 years of combined public timing data for PSR J1939+2134, the paper reports a nearly sinusoidal timing variation with a period close to the data span, which it interprets as either a moon-sized planet at about 11 AU or slow precession.